二维平动长籽晶KDP类晶体循环过滤生长技术研究  

Two-Dimensional Translational Growth and Properties of Long-Seed KDP-Type Crystals

作　　者：陶光辉 王斌[1] 齐红基[1] 邵建达[1] 吴福林[1] 陈端阳[1] 陈征民 Tao Guanghui;Wang Bin;Qi Hongji;Shao Jianda;Wu Fulin;Chen Duanyang;Chen Zhengmin(Key Laboratory of Intense Laser Materials,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]中国科学院上海光学精密机械研究所强激光材料重点实验室,上海201800

出　　处：《中国激光》2024年第19期267-274,共8页Chinese Journal of Lasers

基　　金：国家科技专项资助项目。

摘　　要：瞄准KDP类晶体12 J/cm^(2)激光损伤阈值,从改善晶体生长表面的溶质分布情况着手,围绕新型KDP类晶体生长方法——二维平动技术全过程进行了初步研究。从生长设备、点晶方式、生长工艺等方面,研究了不同平移速度、平移加速度等生长参数下的晶体生长工艺。针对长籽晶点晶过程及成锥过程中易诱发杂晶产生的问题,提出了螺旋式点晶方式,将籽晶通过螺纹稳定地固定在晶盘上,使籽晶平移运动时产生的晃动幅度减小,从而减小对生长溶液的扰动。针对KDP类晶体生长对装置的要求,笔者设计并搭建了一套满足晶体二维平动生长要求的实验装置。通过紫外-可见吸收光谱、抗激光损伤阈值、荧光光谱等对晶体的性能进行分析,结果表明,在该二维平动生长方式下生长的晶体具有良好的光学质量以及较高的激光损伤阈值。Objective KDP-type crystals are excellent nonlinear optical crystal materials that have a high laser threshold,wide transmittance band,high electro-optical coefficient,optical uniformity,and large size.Inertial confinement fusion(ICF)driven by high-power lasers has several requirements for crystal materials,such as a large aperture,a high laser damage threshold,large nonlinear optics,a wide transmission band,and low refractive index inhomogeneity.Thus far,only KDP-type crystals have met these requirements.Therefore,large KDP-type crystals are the only crystalline materials that can be used as electro-optical switches and frequency-conversion devices in ICF.The rapid growth method of KDP-type crystals eliminates the 0.5 mm/d growth rate limit of the traditional growth method and shortens the growth cycle from 2‒3 years to 4‒5 months.However,with the continuous power increase in ICF experiments worldwide,the requirements for KDP/DKDP crystals(particularly laser damage resistance)are increasing.Therefore,research on crystal growth remains significant.The key factor affecting the quality of crystal growth is the distribution of the solute concentration,which depends on the convective mode on the crystal surface.The two-dimensional growth mode allows the crystal surface to achieve a periodic reversible shear flow and improves the distribution uniformity of the solute concentration on the crystal surface.Methods To meet the requirements of the KDP crystal growth device,a set of experimental devices for two-dimensional crystal growth was designed and built.The device includes a growth tank,two-dimensional moving platform,and continuous filtration system.A temperature test was performed on the device to ensure that the temperature of the growth tank met the design requirements.To address the sealing problem of a crystal growth vessel(growth tank),a set of water-sealing devices that can satisfy the sealing demand of the tank was designed.A continuous filtration system can effectively reduce the particle concentration

关 键 词：材料 KDP类晶体 长籽晶 二维平动 快速生长 

分 类 号：O782[理学—晶体学]